Tests Show Chemical Has Largely Dissipated, Officials Say

CHARLESTON, W.Va.—Officials in Kentucky and Ohio were preparing Monday for the arrival of a slow-moving, 60-mile-long chemical plume drifting toward them down the Ohio River, after its accidental release prompted a five-day water ban here.

While many said they didn't foresee a major problem, they also weren't taking chances after the release of the chemical, called 4-methylcyclohexane methanol, or MCHM. Cincinnati Mayor John Cranley...

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